Re: few questions about gateway load balancing protocol

AVG assigns each router (including itself) a virtual MAC in order for them to reply ARP requests...

3)What is GLBP peer?

Routers with GLBP enabled participating in the same GLBP group.

does it include only active virtual gateway and active virtual forwarders?

All routers, see above.

or it also include those routers which are not active virtual forwarder but are backup routers?

There isn't a concept of backup in GLBP, all routers are forwarding traffic.

4)Do only active virtual gateway and active virtual forwarders exchanges hellos? or back up routers also exchanges hellos?

Again, no backup router concept in GLBP. GLBP members communicate between each other through hello messages sent every 3 seconds to the multicast address 224.0.0.102, User Datagram Protocol (UDP) port 3222 (source and destination).

Re: few questions about gateway load balancing protocol

Hi Edison!

Let me quote from my book

" The AVG (active virtual gateway) also assigns the necessary virtual mac addresses to each of the routers participating in GLBP group. Upto four virtual Mac addresses can be used in any group. each of these routers is refered to as an active virtual forwarded(AvF),forwarding traffic received on its virtual mac address. other routers in the group serve as backup or secondary virtual forwarders,in case AVF fails"

Re: few questions about gateway load balancing protocol

According to the Cisco link, only AVG and standby virtual gateway load balance the traffic while others stay in listening state.

But according to the book and above link, up to four routers also knows as AVF load balance the traffic while the others , also known as secondary AVF, stay in listening state. Secondary AVF listen to group' messages.

Do these Secondary avf only listen or they send their hellos to AVG like AVFs routers?

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